Download 2012 ASHRAE Handbook - Heating, Ventilating, and by ASHRAE PDF
By ASHRAE
This guide discusses numerous platforms and the apparatus (components or assemblies) they include, and describes beneficial properties and alterations. this knowledge is helping approach designers and operators in picking out and utilizing gear. This variation features a new bankruptcy 18, Variable-Refrigerant-Flow platforms, which describes those platforms, their elements, and acceptable criteria intimately, and features a approach layout instance and demanding tips on expenditures, controls, and safeguard. This instruction manual is a reference for engineers operating in HVAC&R and for execs in allied fields. ASHRAE, based in 1894, is a world association of a few 50,000 folks. ASHRAE fulfills its venture of advancing heating, air flow, air con, and refrigeration to serve humanity and advertise a sustainable international via examine, criteria writing, publishing, and carrying on with schooling.
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Additional resources for 2012 ASHRAE Handbook - Heating, Ventilating, and Air-Conditioning Systems and Equipment (I-P Edition)
Sample text
Many communities limit machinery sound pressure levels at the property line, which affects the design and placement of equipment. See Chapter 48 of the 2011 ASHRAE Handbook-HVAC Applications for more detailed information on sound and vibration. Seismic and Wind Issues Depending on code requirements and the facility’s location with respect to seismic fault lines, seismic bracing may be required for the central plant equipment and distribution. For instance, a hospital located in a seismically active area must be able to remain open and operational to treat casualties in the aftermath of an earthquake.
All treated and untreated air must be well mixed for maximum performance of heat transfer surfaces and for uniform temperatures in the airstream. Stratified, parallel paths of treated and untreated air must be avoided, particularly in the vertical plane of systems using double-inlet or multiple-wheel fans. Because these fans may not completely mix the air, different temperatures can occur in branches coming from opposite sides of the supply duct. Poor mixing in units with high outdoor percentages can also result in freezing temperatures at the coils.
In some applications, heating is accomplished by a separate heat source. The term zoneimplies the provision of, or the need for, separate thermostatic control, whereas the term room implies a partitioned area that may or may not require separate control. The basic all-air system concept is to supply air to the room at conditions such that the sensible and latent heat gains in the space, when absorbed by supply air flowing through the space, bring the air to the desired room conditions. Because heat gains in the space vary with time, a mechanism to vary the energy removed from the space by the supply air is necessary.